1 product features ? at cut 32.768 khz xo ? cmos compatible logic levels ? ultra low active current (< 10a) ? very tight temperature stability ? designed for standard reflow and washing techniques ? pb-free and rohs/green compliant product description the kx251 series real time clock oscillator achieves superb stability over a broad range of operating conditions. it utilizes pericom proprietary technology to achieve ultra low current less than 10a. the output clock signal is compatible with lvcmos/lvttl logic levels. the device, available on tape and reel, is contained in a 2.5 x 2.0mm surface-mount ceramic package. applications ? real-time clock oscillator where low current and tight stability are needed package: ( scale: none; dimensions are in mm ) pin functions: pin function 1 oe function 2 ground 3 clock output 4 v dd 2.5 x 2.0mm ceramic smd part ordering information: following the above format, saronix-ecera part numbers will be assigned upon confirmation of exact customer requirements. recommended land pattern: created using cadstd lite freeware from www.cadstd.com. non-commercial use only. created using cadstd lite freeware from www.cadstd.com. non-commercial use only. kx 251 v i s 032.768000 a b d stability temp range a = +/-20 ppm -20/+70c b = +/-25 ppm -20/+70c c = +/-50 ppm -20/+70c d = +/-25 ppm -40/+85c e = +/-50 ppm -40/+85c f = +/-20 ppm 0/+70c g = +/-25 ppm 0/+70c h = +/-25 ppm 0/+85c i = +/-25 ppm -20/+85c z = reference design stability and temp range: frequency: fff.ffffff khz, ?3 digits/decimal/6 digits? format voltage: 1=+3.3v 2=+2.5v 3=+1.8v b=+3.0v c internal #: 0 ~ 9 all specifications are subject to change without notice. kx251 rev c 8 /27/2014 saronix-ecera? is a pericom? semiconductor company ? us: +1-408-435-0800 tw: +886-3-4518888 ? www .saronix-ecera.com cmos 32.768khz ultra low current kx series crystal oscillator 2.5 x 2.0mm kx251 14-0033
2 output enable / disable function parameter min. typ. max. units notes input voltage (pin 1), output enable 0.7 v dd v or open input voltage (pin 1), output disable (low power standby) 0.3 v dd v output is hi-z internal pullup resistance 100 k output disable delay 100 ns output enable delay 10 ms electrical performance parameter min. typ. max. units notes output frequency 32.768 khz supply voltage +1.71 +1.8 +1.89 v see part ordering options +2.25 +2.5 +2.75 v +2.85 +3.0 +3.15 v +3.0 +3.3 +3.6 v supply current, output enabled 10 15 a at 15pf load supply current, standby mode 0.5 a output hi-z frequency stability 50 ppm see part ordering options, and note 1 operating temperature range -40 +85 c see part ordering options output logic 0, v ol 0.1 v dd v output logic 1, v oh 0.9 v dd v output load 15 pf see note 2 duty cycle 45 55 % measured 50% of v dd rise and fall time 35 50 ns measured 20/80% of v dd start-up time 10 ms notes: 1. stability includes all combinations of operating temperature, load changes, rated input (supply) voltage changes, initial calibration tolerance (25c), aging (1 year at 25c average ef fective ambient temperature), shock and vibration. 2. for specifcations othere than those listed, please contact sales. absolute maximum ratings parameter min. typ. max. units notes storage temperature -55 +125 c for the latest product information visit: http://www.pericom.com/products/timing/oscillators/kx251/ for test circuit go to : http://www.pericom.com/pdf/sre/tc_hcmos2.pdf for soldering reflow profile and reliability test ratings go to: http://www.pericom.com/pdf/sre/reflow.pdf for tape and reel information go to: http://www.pericom.com/pdf/sre/tr_2520_xo.pdf all specifications are subject to change without notice. kx251 rev c 8 /27/2014 saronix-ecera? is a pericom? semiconductor company ? us: +1-408-435-0800 tw: +886-3-4518888 ? www .saronix-ecera.com cmos 32.768khz ultra low current kx series crystal oscillator 2.5 x 2.0mm kx251 14-0033
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